#include<iostream>
using namespace std;
int ex3_2_3()
{
	float x, y;
	cin >> x;
	cin >> y;
	if (x >= -1 && x<=1 && y>=-1 && y <= 1)
	{
		cout << "Yes" << endl;
	}
	else
	{
		cout << "No" << endl;
	}
	return 0;
}